What does denary mean?
Denary is a formal adjective meaning based on or relating to the number ten — in other words, decimal. It is used chiefly in mathematics, computing, and technical writing when distinguishing the familiar base-ten system from alternatives such as binary (base two) or hexadecimal (base sixteen); one might speak of converting a binary number into its denary equivalent or of a denary scale of measurement. The word derives from Latin denarius, 'containing ten', which also named the standard Roman silver coin. Although largely displaced by the more common 'decimal' in everyday use, denary persists in British mathematics education and technical literature, lending precision when contrasting numeral systems. Its rarity gives it a slightly scholarly flavor, making it useful for writers who want exact terminology rather than the generic 'decimal'.
Relating to, based on, or counted in groups of ten; decimal.
"Pupils learned to translate binary strings into denary values."
Mostly found in mathematical and educational contexts; 'decimal' is the usual everyday term.
A denarius, an ancient Roman silver coin.
"The hoard contained several coins, among them a single worn denary."
Rare and chiefly of historical or numismatic interest.
Applies only to the rare noun sense referring to the Roman coin; as an adjective, denary does not inflect.
"The museum's collection includes several denaries minted under Hadrian."
Before 'decimal' stole the spotlight, English speakers described base-ten counting with 'denary' — a word that still survives quietly in mathematics textbooks.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of denary
Denary comes from Latin dēnārius, meaning 'containing ten', formed from dēnī ('ten each') on the root decem ('ten'). The same Latin word denoted the denarius, the standard Roman silver coin whose name also survives in the abbreviation 'd.' formerly used for British pence. English adopted the adjective in the late sixteenth century, primarily for arithmetic based on tens. It shares its Indo-European root *deḱm̥ ('ten') with words such as decimal, December, decimate, and dime.
How denary is actually used
Formal and technical in register, appearing chiefly in mathematics and computing contexts where precision about number bases matters. In everyday speech and writing, 'decimal' is strongly preferred.
Easily confused with denary
Denarii is simply the plural of denarius (the ancient Roman coin), whereas denary as a noun refers to such a coin itself and more often functions as an adjective meaning 'based on ten'.